Determination of Lead in Eye Shadow and Blush by High-Resolution Continuum Source Graphite Furnace Atomic Absorption Spectrometry Employing Direct Solid Sampling

نویسندگان

  • Ariane I. Barros
  • Tiago V. Silva
  • Edilene C. Ferreira
  • José A. Gomes Neto
چکیده

A espectrometria de absorção atômica em forno de grafite de alta resolução com fonte contínua (HR-CS GF AAS) é proposta para determinar Pb em sombra de olho e blush empregando a análise direta de sólidos. O emprego da mistura de modificadores químicos Pd(NO3)2 + Mg(NO3)2 possibilitou a calibração aquosa de 0,25 a 2,5 ng Pb (r = 0,998). O desempenho do método proposto foi avaliado por meio da análise de digeridos de sombra e de blush por espectrometria de absorção atômica em forno de grafite com fonte de linhas (LS GF AAS) como técnica comparativa. Os resultados obtidos por HR-CS GF AAS e LS GF AAS foram concordantes entre si a um nível de confiança de 95% (teste t pareado). O limite de quantificação (massa seca) foi de 0,020 ng mg−1. A concentração de Pb nas amostras de sombra de olho e de blush variou de 1,222 a 9,632 ng mg−1 e 0,362 a 28,091 ng mg−1, respectivamente.

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تاریخ انتشار 2015